building-standards-act-mcp

条文取得

get_law

Read-onlyIdempotent

Retrieve specific articles from Japanese building standards laws by law name and article number, with alias, appendix, and structured JSON support to validate citations.

Instructions

条番号を指定して法令の条文を取得する。附則・別表にも対応。略称・正式名称のいずれでも指定可能。format=structured で条→項→号の階層構造をJSON形式で取得可能。format=text の上限は、structuredContent を含む応答全体が約5万字に収まる値。長い条の中の項・表の行は find で探し、offset を推測しない。

Input Schema

Name	Required	Description	Default
`find`	No	この条の本文から探す語。指定すると最初の一致を含む行から本文を返し、一致位置の一覧を matches に入れる。空白は無視し、全角・半角の違いは区別しない。長い条の中の項・表の行を探すときに使い、offset を推測しない。format=text のみ適用。続きは find を外して next_offset を指定。
`format`	No	出力形式。text: 従来のテキスト形式、structured: 条→項→号の階層を持つJSON構造化形式	text
`offset`	No	本文の取得開始位置（0から始まる文字位置）。続きは案内された offset を指定。format=text のみ適用。
`law_name`	Yes	法令名（正式名称、略称のいずれか。例: 建築基準法、建基法）
`max_chars`	No	本文と参照一覧（references）を合わせた最大文字数（1,000〜24,000）。省略時は20,000文字。format=text のみ適用。
`article_number`	Yes	条文番号（例: 第20条、20、第6条の2、附則、附則第3条、別表第一）

Output Schema

Name	Required	Description	Default
`find`	No
`note`	No
`format`	Yes
`offset`	No
`source`	Yes
`article`	Yes
`law_num`	Yes
`matches`	No
`revision`	No
`law_title`	Yes
`truncated`	No
`next_offset`	No
`total_chars`	No
`matches_total`	No
`revision_note`	No
`references_total`	No
`references_truncated`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed5 schema fields changedv1.11.2Oct 19, 2026

removedInput schema / additionalProperties
```
Removed value: -false
```

addedInput schema / properties / find

Added value: +{
+  "description": "この条の本文から探す語。指定すると最初の一致を含む行から本文を返し、一致位置の一覧を matches に入れる。空白は無視し、全角・半角の違いは区別しない。長い条の中の項・表の行を探すときに使い、offset を推測しない。format=text のみ適用。続きは find を外して next_offset を指定。",
+  "maxLength": 100,
+  "minLength": 1,
+  "type": "string"
+}

addedInput schema / properties / max_chars

Added value: +{
+  "default": 20000,
+  "description": "本文と参照一覧（references）を合わせた最大文字数（1,000〜24,000）。省略時は20,000文字。format=text のみ適用。",
+  "maximum": 24000,
+  "minimum": 1000,
+  "type": "integer"
+}

addedInput schema / properties / offset

Added value: +{
+  "default": 0,
+  "description": "本文の取得開始位置（0から始まる文字位置）。続きは案内された offset を指定。format=text のみ適用。",
+  "maximum": 9007199254740991,
+  "minimum": 0,
+  "type": "integer"
+}

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "additionalProperties": false,
+  "definitions": {
+    "__schema0": {
+      "additionalProperties": false,
+      "properties": {
+        "subitem_num": {
+          "type": "string"
+        },
+        "subitem_sentence": {
+          "type": "string"
+        },
+        "subitem_title": {
+          "type": "string"
+        },
+        "subitems": {
+          "items": {
+            "$ref": "#/definitions/__schema0"
+          },
+          "type": "array"
+        }
+      },
+      "required": [
+        "subitem_num",
+        "subitem_title",
+        "subitem_sentence",
+        "subitems"
+      ],
+      "type": "object"
+    }
+  },
+  "properties": {
+    "article": {
+      "anyOf": [
+        {
+          "additionalProperties": false,
+          "properties": {
+            "article_caption": {
+              "type": "string"
+            },
+            "article_num": {
+              "type": "string"
+            },
+            "article_title": {
+              "type": "string"
+            },
+            "references": {
+              "items": {
+                "additionalProperties": false,
+                "properties": {
+                  "raw_text": {
+                    "type": "string"
+                  },
+                  "ref_type": {
+                    "enum": [
+                      "same_law",
+                      "cross_law",
+                      "relative",
+                      "delegation",
+                      "unknown"
+                    ],
+                    "type": "string"
+                  },
+                  "target_article": {
+                    "type": "string"
+                  },
+                  "target_item": {
+                    "type": "string"
+                  },
+                  "target_law": {
+                    "type": "string"
+                  },
+                  "target_paragraph": {
+                    "type": "string"
+                  }
+                },
+                "required": [
+                  "raw_text",
+                  "ref_type"
+                ],
+                "type": "object"
+              },
+              "type": "array"
+            },
+            "text": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "article_num",
+            "article_caption",
+            "article_title",
+            "text"
+          ],
+          "type": "object"
+        },
+        {
+          "additionalProperties": false,
+          "properties": {
+            "article_caption": {
+              "type": "string"
+            },
+            "article_num": {
+              "type": "string"
+            },
+            "article_title": {
+              "type": "string"
+            },
+            "paragraphs": {
+              "items": {
+                "additionalProperties": false,
+                "properties": {
+                  "items": {
+                    "items": {
+                      "additionalProperties": false,
+                      "properties": {
+                        "item_num": {
+                          "type": "string"
+                        },
+                        "item_sentence": {
+                          "type": "string"
+                        },
+                        "item_title": {
+                          "type": "string"
+                        },
+                        "subitems": {
+                          "items": {
+                            "$ref": "#/definitions/__schema0"
+                          },
+                          "type": "array"
+                        }
+                      },
+                      "required": [
+                        "item_num",
+                        "item_title",
+                        "item_sentence",
+                        "subitems"
+                      ],
+                      "type": "object"
+                    },
+                    "type": "array"
+                  },
+                  "paragraph_num": {
+                    "type": "string"
+                  },
+                  "paragraph_sentence": {
+                    "type": "string"
+                  }
+                },
+                "required": [
+                  "paragraph_num",
+                  "paragraph_sentence",
+                  "items"
+                ],
+                "type": "object"
+              },
+              "type": "array"
+            },
+            "references": {
+              "items": {
+                "additionalProperties": false,
+                "properties": {
+                  "raw_text": {
+                    "type": "string"
+                  },
+                  "ref_type": {
+                    "enum": [
+                      "same_law",
+                      "cross_law",
+                      "relative",
+                      "delegation",
+                      "unknown"
+                    ],
+                    "type": "string"
+                  },
+                  "target_article": {
+                    "type": "string"
+                  },
+                  "target_item": {
+                    "type": "string"
+                  },
+                  "target_law": {
+                    "type": "string"
+                  },
+                  "target_paragraph": {
+                    "type": "string"
+                  }
+                },
+                "required": [
+                  "raw_text",
+                  "ref_type"
+                ],
+                "type": "object"
+              },
+              "type": "array"
+            }
+          },
+          "required": [
+            "article_num",
+            "article_caption",
+            "article_title",
+            "paragraphs"
+          ],
+          "type": "object"
+        }
+      ]
+    },
+    "find": {
+      "type": "string"
+    },
+    "format": {
+      "enum": [
+        "text",
+        "structured"
+      ],
+      "type": "string"
+    },
+    "law_num": {
+      "type": "string"
+    },
+    "law_title": {
+      "type": "string"
+    },
+    "matches": {
+      "items": {
+        "type": "number"
+      },
+      "type": "array"
+    },
+    "matches_total": {
+      "type": "number"
+    },
+    "next_offset": {
+      "type": [
+        "number",
+        "null"
+      ]
+    },
+    "note": {
+      "type": "string"
+    },
+    "offset": {
+      "type": "number"
+    },
+    "references_total": {
+      "type": "number"
+    },
+    "references_truncated": {
+      "type": "boolean"
+    },
+    "revision": {
+      "additionalProperties": false,
+      "properties": {
+        "amendment_enforcement_date": {
+          "type": "string"
+        },
+        "current_revision_status": {
+          "type": "string"
+        },
+        "law_revision_id": {
+          "type": "string"
+        }
+      },
+      "required": [
+        "law_revision_id",
+        "amendment_enforcement_date",
+        "current_revision_status"
+      ],
+      "type": "object"
+    },
+    "revision_note": {
+      "type": "string"
+    },
+    "source": {
+      "const": "e-Gov法令検索",
+      "type": "string"
+    },
+    "total_chars": {
+      "type": "number"
+    },
+    "truncated": {
+      "type": "boolean"
+    }
+  },
+  "required": [
+    "law_title",
+    "law_num",
+    "source",
+    "format",
+    "article"
+  ],
+  "type": "object"
+}

First observedv1.7.0Jun 29, 2026

TDQS

A3.7/5.0

Behavior4/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already cover the safety profile (readOnly, idempotent, openWorld, non-destructive). The description adds genuinely useful behavior: the ~50,000-character cap on the whole response including structuredContent, the structured JSON hierarchy, and the find/matches continuation pattern. It does not describe auth or rate limits, but adds real context beyond the annotations.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Four dense sentences, purpose front-loaded, each carrying distinct information (scope, format options, size limit, find/offset rule). No filler, though the limit sentence is a bit convoluted.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

An output schema exists, so return-shape explanation is unnecessary and the description rightly focuses on format choice, size cap, and pagination via find/offset. Covers what an agent needs to call it correctly, with the only gap being tool-level alternatives.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100% and the per-parameter descriptions are already rich (find semantics, offset, max_chars range, enum for format). The description restates format=text vs structured and the find/offset workflow but adds little syntax or meaning beyond the schema. Baseline 3 is correct.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

Specific verb+resource: retrieve a law's provisions by article number, with explicit coverage of 附則・別表 and acceptance of abbreviations or official names. This implicitly separates it from get_full_law (whole law) by keying on a single article, but no sibling is named explicitly, so it stops short of a 5.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

It gives good intra-tool guidance (use find for paragraphs/table rows in long articles, don't guess offset; format=structured for hierarchical JSON), but there is no statement of when to choose this tool over search_articles, search_law, or get_full_law. Usage across siblings is left to inference.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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